Hoisting-derrick



(No Model.)

A. B; MORRISON.

HOISTING DERRIGK.

No. 297,831. PatntedaApr. 29', 1884.

O D 2i? (Z 53 9 oz P a 5 a 5 UNITED STATES PATENT OFFICE.

ANDREW B. MORRISON, or LITOHFIELD, ILLINOIS.

HOlSTI'NG-DERFllCK.

SPECIFICATION formingv part of Letters Patent No. 297,831, dated April 29, 1884-.

I Application filed February 6, 1884. (No model.)

To all whom it may concern: 7

Be it known that I, ANDREW BROWN Mon- RIsoN, a citizen of the United States, residing at Litchfield, in the county of Montgomery and State of Illinois, have invented certain new and useful Improvements in Hoisting- Derricks, of which thefollowing is a specification, reference being had therein to the ac-' companying drawings.

My invention relates to certain new and useful improvements in portable tripodsor derricks for lifting heavy weights.

The objectof my invention is to lift rock or heavy weights, when desirable, from the surface ofthe earth onto wagons or cars for transportation, or to raiserock or mineral from mines by means of a portable tripod or derrick. I attain these objects by means of the peculiar construction. and arrangement of the various partsof my device, which will be more fully pointedout and described in the specification and claims, reference being had to the drawings accompanying this application and forming part of the same, in which Figure 1 is a side elevation of my invention, showing frame expanded and weight raised. Fig. 2 is an end elevation of the "same, and Fig. 3'shows detail views of same.

Similar letters refer to similar parts th roughout the drawings. 7

Referring to the drawings, A represents a frame or tripod constructed of standards B B and O, said standards being pivoted at their outer ends to a metal cap, E, which is constructed with downwardly-projecting flanges hook, to which the weight to be lifted isa-thaving perforations, by means of which and suitable pins said standards are held in place loosely and allowed to expand or contract at their inner ends. Cap E is also provided with a central perforation adapted to receive and hold an eyebolt, a, to which is secured a loose pulley, at", over which passes rope (1 one end of said rope being attached to the lower end of 'a strap clasping said pulley. The opposite end of said rope (1 passing over pulley d, (which is provided with a suitable tached,) passes over roller d and around drum or cylinder (1, to which it is secured.

.Drum or shaft d is journaled in plates 0, se-

cured to the outer faces of standards B B, and is provided with a gear-wheel, d, which is adapted or arranged to gear into a smaller gear-wheel, b, which is secured to shaft 12, said shaft being provided with crank-arms b.

The inner ends of standards B B are mortised into crossbar D, on which they rest.

A suitable tie'bolt and crossbar, b is placed about midway between the inner and outer ends of standards B B, the purpose of which is to stiffen and hold the parts in place' Between the standards, as shown suspended, is the weight 11".

The cap E is formed triangular in shape,

'With angular openings 0 near the corners for the reception of the upper ends of standards B and 0, said cap being provided with a top cover, f, from which project cross stiffening ribs 9, which are centrally perforated to receive bolt a. I

The operation is as follows: Erect the tripod above the weight to be lifted, attach the hook on pulley d* to the same, and turn the crank-arms b, when, by means of the small 'pinion or gear-wheel b acting on gear-wheel d,thc rope d is wound around the drum d and the weight raised, when the tripod can be taken down and removed to another place to repeat the operation.

By this construction a cheap and durable device is formed, by means of which rocks,

stumps, or heavy 'weightsare easily handled,

the simplicity and portability of the device being important features.

Having thus described my invention,whatl claim, and desire to secure by Letters Patent,

1. A portable tripod consisting of three adjustable standards, two of which are secured by their inner ends to a cross-piece, all of said standards being joined to a metal plate at their outer ends, said plate supporting tackleblocks, with rope connection to winding mechanism secured tothe outside of said standards.

2. A tripod-derrick consisting of the standards B B and C, the cross-bar D, bindingrod 1), and the metal cap E, in combination with the'eyebolt a, pulleyblocks (1*, roller (2 drum (1,- shaft b, arms I), gear-wheels If and (1, caps a, rope d and the weight b all arranged and operated substantially as shown.

In testimony whereof I affix my signature in presence of two witnesses.

\Vitnesses: ANDREW B. MORRISON.

A. BUPPERT, PHILIP F. LARNER. I

Ice 

